发明授权
- 专利标题: Digital-to-analog converter device for processing PCM signals of different sampling frequencies
- 专利标题(中): 用于处理不同采样频率的PCM信号的数模转换器
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申请号: US578787申请日: 1984-02-10
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公开(公告)号: US4614934A公开(公告)日: 1986-09-30
- 发明人: Masaharu Kobayashi , Takaharu Noguchi , Keizo Nishimura , Hiromichi Tanaka , Masami Nishida , Takao Arai
- 申请人: Masaharu Kobayashi , Takaharu Noguchi , Keizo Nishimura , Hiromichi Tanaka , Masami Nishida , Takao Arai
- 申请人地址: JPX Tokyo
- 专利权人: Hitachi, Ltd.
- 当前专利权人: Hitachi, Ltd.
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX58-40658 19830314
- 主分类号: H03M1/66
- IPC分类号: H03M1/66 ; H03M1/00 ; H04B14/04
摘要:
A digital-to-analog converter device for PCM signals at different sampling frequencies comprises a signal converter which expands the frequency distance between a PCM signal band and a side band by converting the sampling frequencies associated with the PCM signals to be reproduced into higher frequencies. With this signal converter, a single low-pass filter can be simplified, having a gradual ramp cut-off characteristic for removal of the side band wherein a pass band cut-off frequency and a stop band cut-off frequency can be adapted for low pass filtering of the PCM signals at different sampling frequencies.
公开/授权文献
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